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參數(shù)資料
| 型號： | M93C56 |
| 廠商： | 意法半導體 |
| 英文描述： | Serial Microwire Bus EEPROM(串行EEPROM) |
| 中文描述： | 微型導線串行總線的EEPROM（串行EEPROM中） |
| 文件頁數(shù)： | 14/18頁 |
| 文件大?。?/td> | 115K |
| 代理商： | M93C56 |
AI01395
S
An-1
C
D
WRITE
START
D0
”1”
”0”
An
Glitch
An-2
ADDRESS AND DATA
ARE SHIFTED BY ONE BIT
Figure 9. WRITESequence with One Clock Glitch
CLOCKPULSE COUNTER
The M93Cx6 offers a functional security block
which filters glitches on the clock input (C), the
clock pulse counter.In a normal environment, the
M93Cx6 expects to receive the exact number of
data bits on the D input (start bit, Op-Code, Ad-
dress, Data); that is the exact amount of clock
pulseson the C input.
In a noisy environment, the number of pulses re-
ceived (on the clock input C) may be greater than
theclockpulsesdeliveredbytheMaster(Microcon-
troller) driving the M93Cx6. In such a case, a part
of the instruction can be delayed by one or more
bits (see Figure9), and may induce an erroneous
write of data at an invalid address. The M93Cx6
has an on-chip counter which counts the clock
pulsesfromthe Startbituntilthe fallingedgeof the
ChipSelect signal.
For the WRITE instructions with a M93C56 (or
M93C66), the number of clock pulses incoming to
the counter mustbe exactly20 (with the organisa-
tionx8)from theStartbit to thefallingedge of Chip
Selectsignal(1Startbit+ 2Op-codebit+9Address
bit+8 Databit=20):ifso,theM93C56(orM93C66)
executes the WRITE instruction; if the number of
clock pulses is not equal to 20, the instruction will
not be executed(and data will not be corrupted).
In the same way, when the organisation x16 is
selected with the M93C56 (or M93C66),the num-
ber of clock pulses incoming to the counter must
be exactly 27 (1 Start bit + 2 Op-code bit + 8
Addressbit + 16 Data bit = 27) fromthe Start bit to
the falling edge of Chip Select signal: if so, the
M93C56(or M93C66)executestheWRITEinstruc-
tion; if the number of clock pulses is not equal to
27, the instruction will not be executed (and data
will not be corrupted). The clock pulse counter is
active on the WRITE, ERASE, ERAL and WRALL
instructions.
In order to determine the exact number of clock
pulsesneededforalltheM93Cx6familyonERASE
andWRITEinstructions,referto the Tables7A, 7B
and 7C, in the column:Requested Clock Cycles.
14/18
M93C86, M93C76, M93C66, M93C56, M93C46,M93C06
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相關代理商/技術參數(shù) |
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|---|---|
| M93C56_11 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:16 Kbit, 8 Kbit, 4 Kbit, 2 Kbit and 1 Kbit (8-bit or 16-bit wide) MICROWIRE?? serial access EEPROM |
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| M93C56BN | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:16Kbit, 8Kbit, 4Kbit, 2Kbit, 1Kbit and 256bit 8-bit or 16-bit wide |
| M93C56-BN | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:16Kbit, 8Kbit, 4Kbit, 2Kbit and 1Kbit (8-bit or 16-bit wide) MICROWIRE Serial Access EEPROM |
| M93C56-BN3 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:16Kbit, 8Kbit, 4Kbit, 2Kbit and 1Kbit (8-bit or 16-bit wide) MICROWIRE Serial Access EEPROM |
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